Updated on 2025/06/28

写真a

 
TANAKA Ryoji
 
Organization
Scheduled update Professor
Position
Professor
Homepage
https://sites.google.com/view/ryojitanaka/
External link

Degree

  • 博士（理学） ( 北海道大学 )

Research Interests

  • Cosmochemistry

  • Geochemistry

  • radiogenic isotope

  • stable isotope

  • 地球宇宙化学

  • 放射性同位体

  • 安定同位体

Research Areas

  • Natural Science / Solid earth sciences

  • Natural Science / Space and planetary sciences

Education

  • Hokkaido University    

    - 1997

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  • Hokkaido University   理学研究科   地球惑星科学専攻

    - 1997

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    Country： Japan

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  • Hokkaido University    

    - 1992

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  • Hokkaido University   工学部   資源開発工学科

    - 1992

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    Country： Japan

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Research History

  • - Professor,Institute for Study of the Earth's Interior,Okayama University

    2018

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  • - 岡山大学惑星物質研究所 教授

    2018

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  • Okayama University   The Institute for Planetary Materials

    2009 - 2018

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  • Associate Professor,Institute for Study of the Earth's Interior,Okayama University

    2009 - 2018

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  • 岡山大学地球物質科学研究センター 助教

    2007 - 2008

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  • Assistant Professor,Institute for Study of the Earth's Interior,Okayama University

    2007 - 2008

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  • 岡山大学地球物質科学研究センター 助手

    2006 - 2007

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  • Research Associate,Institute for Study of the Earth's Interior,Okayama University

    2006 - 2007

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  • 岡山大学地球物質科学研究センター 職員（技術系）

    2005 - 2006

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  • Technical Staff,Institute for Study of the Earth's Interior,Okayama University

    2005 - 2006

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  • 岡山大学固体地球研究センター 職員（技術系）

    2000 - 2005

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  • Technical Staff,Institute for Study of the Earth's Interior,Okayama University

    2000 - 2005

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  • 岡山大学固体地球研究センター 大学等非常勤研究員

    1997 - 2000

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  • Part-time researcher for university or other academic organization,Institute for Study of the Earth's Interior,Okayama University

    1997 - 2000

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  • Part-time researcher for university or other academic organization,University Museum, University of Tokyo

    1997

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  • The University of Tokyo   The University Museum

    1997

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Professional Memberships

 

Papers

  • Petrogenesis of the Rantila meteorite fall and implications for the origin of aubrites

    Yash Srivastava, Amit, Varsha M. Nair, Avadh Kumar, Yogita Kadlag, Ramakant R. Mahajan, Neeraj Srivastava, Neha Panwar, Aditya Das, Ryoji Tanaka, James Day, Anil D. Shukla, Dwijesh Ray, Abhishek J. Verma, Alka Rani, Garima Arora, Dipak K. Panda, S. Vijayan, Anil Bhardwaj

    Meteoritics & Planetary Science   2025.4

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    Language：English   Publishing type：Research paper (scientific journal)  

    <jats:title>Abstract</jats:title><jats:p>Aubrites are rare meteorites from highly reduced differentiated parent bodies. The Rantila meteorite was recovered soon after falling on 17 August 2022 at Rantila and Ravel villages in Gujarat state, India. We report the petrography, mineralogy, chemical composition, oxygen‐ and chromium‐isotope compositions, along with reflectance spectroscopy, all showing that Rantila is an aubrite. Coarse enstatite and diopside grains constitute the main mass of Rantila, while mm‐wide fracture domains pervade the coarse enstatites. In the fractures, comminuted enstatite, diopside blebs, olivine, a plagioclase–silica assemblage, sulfides, and metals occur. Rantila consists of enstatite (&gt;85 vol%), diopside (~8 vol%), forsterite, albite, and silica along with various sulfides and Fe‐Ni alloys. The concentration of rare earth elements is ~1–2 × CI, consistent with main group aubrites. Noble gas and nitrogen isotopic analyses reveal young exposure ages (13.81 ± 6.47 Ma), a heterogeneous nitrogen isotopic composition, and a major K‐Ar resetting event around 3.2 ± 0.4 Ga in the parent body of Rantila. The bulk oxygen isotope values are within the range of aubrites. The chromium isotopic values of Rantila are consistent with main group aubrites. The mineral assemblages, texture, and crystallization modeling suggest that Rantila had an igneous origin. The mineral assemblages in fractures indicate the involvement of external melt possibly during an impact‐fracturing event, which aligns well with the heterogeneous N isotopic composition. Additionally, Rantila shows a wider range of oxygen isotopes than other aubrites suggesting some extent of O isotopic heterogeneity, likely stemming from exogenous processes. The variation in intra‐sample bulk O and N isotope values implies inherent heterogeneity within the main group aubrites, potentially caused by late‐stage impact contamination.</jats:p>

    DOI： 10.1111/maps.14357

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  • Meteoritic and asteroidal amino acid heterogeneity: Implications for planetesimal alteration conditions and sample return missions

    Christian Potiszil, Tsutomu Ota, Masahiro Yamanaka, Katsura Kobayashi, Ryoji Tanaka, Eizo Nakamura

    Earth and Planetary Science Letters   2025.3

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.epsl.2025.119205

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  • Relative importance of Asian-dust-derived micas estimated from oxygen isotopic analysis of fine quartz on specific retention of radiocesium in Andosols in Tohoku Region, Japan Reviewed

    Ryoji Tanaka

    Soil Science and Plant Nutrition   2024.8

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1080/00380768.2024.2387732

    Web of Science

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  • Unraveling the Cr Isotopes of Ryugu: An Accurate Aqueous Alteration Age and the Least Thermally Processed Solar System Material Reviewed

    Ryoji Tanaka, Dilan M. Ratnayake, Tsutomu Ota, Noah Miklusicak, Tak Kunihiro, Christian Potiszil, Chie Sakaguchi, Katsura Kobayashi, Hiroshi Kitagawa, Masahiro Yamanaka, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Satoru Nakazawa, Masahiro Nishimura, Tatsuaki Okada, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Tomohiro Usui, Sei-ichiro Watanabe, Toru Yada, Kasumi Yogata, Makoto Yoshikawa, Eizo Nakamura

    The Astrophysical Journal   965 ( 1 )   52 - 52   2024.4

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    Publishing type：Research paper (scientific journal)   Publisher：American Astronomical Society  

    Abstract

    The analysis of samples returned from the C-type asteroid Ryugu has drastically advanced our knowledge of the evolution of early solar system materials. However, no consensus has been obtained on the chronological data, which is important for understanding the evolution of the asteroid Ryugu. Here, the aqueous alteration age of Ryugu particles was determined by the Mn–Cr method using bulk samples, yielding an age of 4.13 + 0.62/−0.55 Myr after the formation of Ca–Al-rich inclusions (CAI). The age corresponds to 4563.17 + 0.60/−0.67 Myr ago. The higher 55Mn/52Cr, ε 54Cr, and initial ε 53Cr values of the Ryugu samples relative to any carbonaceous chondrite samples implies that its progenitor body formed from the least thermally processed precursors in the outermost region of the protoplanetary disk. Despite accreting at different distances from the Sun, the hydrous asteroids (Ryugu and the parent bodies of CI, CM, CR, and ungrouped C2 meteorites) underwent aqueous alteration during a period of limited duration (3.8 ± 1.8 Myr after CAI). These ages are identical to the crystallization age of the carbonaceous achondirtes NWA 6704/6693 within the error. The ε 54Cr and initial ε 53Cr values of Ryugu and NWA 6704/6693 are also identical, while they show distinct Δ'17O values. This suggests that the precursors that formed the progenitor bodies of Ryugu and NWA 6703/6693 were formed in close proximity and experienced a similar degree of thermal processing in the protosolar nebula. However, the progenitor body of Ryugu was formed by a higher ice/dust ratio, than NWA6703/6693, in the outer region of the protoplanetary disk.

    DOI： 10.3847/1538-4357/ad276a

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    Other Link： https://iopscience.iop.org/article/10.3847/1538-4357/ad276a/pdf

  • Determination of mass-dependent chromium isotopic compositions in geological samples by double spike-total evaporation-thermal ionization mass spectrometry (DS-TE-TIMS) Reviewed

    Dilan M. Ratnayake, Ryoji Tanaka, Eizo Nakamura

    Analytica Chimica Acta   2023.10

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    Authorship：Corresponding author   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.aca.2023.341723

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  • Organic Matter in the Asteroid Ryugu: What We Know So Far Invited Reviewed

    Christian Potiszil, Masahiro Yamanaka, Chie Sakaguchi, Tsutomu Ota, Hiroshi Kitagawa, Tak Kunihiro, Ryoji Tanaka, Katsura Kobayashi, Eizo Nakamura

    Life   2023.6

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.3390/life13071448

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  • The Formation of a Rubble Pile Asteroid: Insights from the Asteroid Ryugu Reviewed

    Tsutomu Ota, Christian Potiszil, Katsura Kobayashi, Ryoji Tanaka, Hiroshi Kitagawa, Tak Kunihiro, Chie Sakaguchi, Masahiro Yamanaka, Eizo Nakamura

    Universe   2023.6

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.3390/universe9060293

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  • Insights into the formation and evolution of extraterrestrial amino acids from the asteroid Ryugu Reviewed

    Christian Potiszil, Tsutomu Ota, Masahiro Yamanaka, Chie Sakaguchi, Katsura Kobayashi, Ryoji Tanaka, Tak Kunihiro, Hiroshi Kitagawa, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Satoru Nakazawa, Masahiro Nishimura, Tatsuaki Okada, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Tomohiro Usui, Sei-ichiro Watanabe, Toru Yada, Kasumi Yogata, Makoto Yoshikawa, Eizo Nakamura

    Nature Communications   14 ( 1 )   2023.3

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    Abstract

    All life on Earth contains amino acids and carbonaceous chondrite meteorites have been suggested as their source at the origin of life on Earth. While many meteoritic amino acids are considered indigenous, deciphering the extent of terrestrial contamination remains an issue. The Ryugu asteroid fragments (JAXA Hayabusa2 mission), represent the most uncontaminated primitive extraterrestrial material available. Here, the concentrations of amino acids from two particles from different touchdown sites (TD1 and TD2) are reported. The concentrations show that N,N-dimethylglycine (DMG) is the most abundant amino acid in the TD1 particle, but below detection limit in the other. The TD1 particle mineral components indicate it experienced more aqueous alteration. Furthermore, the relationships between the amino acids and the geochemistry suggest that DMG formed on the Ryugu progenitor body during aqueous alteration. The findings highlight the importance of aqueous chemistry for defining the ultimate concentrations of amino acids in primitive extraterrestrial samples.

    DOI： 10.1038/s41467-023-37107-6

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    Other Link： https://www.nature.com/articles/s41467-023-37107-6

  • Malotas (b), a new eucrite from an old fall Reviewed

    Marcela E. Saavedra, Julia Roszjar, My E. I. Riebe, María E. Varela, Shuying Yang, Munir Humayun, Ryoji Tanaka, H. Busemann

    Meteoritics & Planetary Science   57 ( 11 )   2081 - 2101   2022.11

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    Publishing type：Research paper (scientific journal)   Publisher：Wiley  

    DOI： 10.1111/maps.13913

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    Other Link： https://onlinelibrary.wiley.com/doi/full-xml/10.1111/maps.13913

  • A rapid method of simultaneous chromatographic purification of Li and Mg for isotopic analyses using MC-ICP-MS Reviewed

    Wei Zhang, Ryoji Tanaka, Hiroshi Kitagawa, Madeleine Bohlin, Eizo Nakamura

    International Journal of Mass Spectrometry   480   116893 - 116893   2022.10

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    Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.ijms.2022.116893

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  • On the origin and evolution of the asteroid Ryugu: A comprehensive geochemical perspective Reviewed

    Eizo NAKAMURA, Katsura KOBAYASHI, Ryoji TANAKA, Tak KUNIHIRO, Hiroshi KITAGAWA, Christian POTISZIL, Tsutomu OTA, Chie SAKAGUCHI, Masahiro YAMANAKA, Dilan M. RATNAYAKE, Havishk TRIPATHI, Rahul KUMAR, Maya-Liliana AVRAMESCU, Hidehisa TSUCHIDA, Yusuke YACHI, Hitoshi MIURA, Masanao ABE, Ryota FUKAI, Shizuho FURUYA, Kentaro HATAKEDA, Tasuku HAYASHI, Yuya HITOMI, Kazuya KUMAGAI, Akiko MIYAZAKI, Aiko NAKATO, Masahiro NISHIMURA, Tatsuaki OKADA, Hiromichi SOEJIMA, Seiji SUGITA, Ayako SUZUKI, Tomohiro USUI, Toru YADA, Daiki YAMAMOTO, Kasumi YOGATA, Miwa YOSHITAKE, Masahiko ARAKAWA, Atsushi FUJII, Masahiko HAYAKAWA, Naoyuki HIRATA, Naru HIRATA, Rie HONDA, Chikatoshi HONDA, Satoshi HOSODA, Yu-ichi IIJIMA, Hitoshi IKEDA, Masateru ISHIGURO, Yoshiaki ISHIHARA, Takahiro IWATA, Kosuke KAWAHARA, Shota KIKUCHI, Kohei KITAZATO, Koji MATSUMOTO, Moe MATSUOKA, Tatsuhiro MICHIKAMI, Yuya MIMASU, Akira MIURA, Tomokatsu MOROTA, Satoru NAKAZAWA, Noriyuki NAMIKI, Hirotomo NODA, Rina NOGUCHI, Naoko OGAWA, Kazunori OGAWA, Chisato OKAMOTO, Go ONO, Masanobu OZAKI, Takanao SAIKI, Naoya SAKATANI, Hirotaka SAWADA, Hiroki SENSHU, Yuri SHIMAKI, Kei SHIRAI, Yuto TAKEI, Hiroshi TAKEUCHI, Satoshi TANAKA, Eri TATSUMI, Fuyuto TERUI, Ryudo TSUKIZAKI, Koji WADA, Manabu YAMADA, Tetsuya YAMADA, Yukio YAMAMOTO, Hajime YANO, Yasuhiro YOKOTA, Keisuke YOSHIHARA, Makoto YOSHIKAWA, Kent YOSHIKAWA, Masaki FUJIMOTO, Sei-ichiro WATANABE, Yuichi TSUDA

    Proceedings of the Japan Academy, Series B   98 ( 6 )   227 - 282   2022.6

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japan Academy  

    DOI： 10.2183/pjab.98.015

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  • The ice-organic-silicate contents of small solar system bodies: indicators for a comet to asteroid evolutionary pathway Reviewed

    Havishk Tripathi, Christian Potiszil, Ryoji Tanaka, Eizo Nakamura

    Monthly Notices of the Royal Astronomical Society   2022.4

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    Publishing type：Research paper (scientific journal)   Publisher：Oxford University Press (OUP)  

    ABSTRACT

    Comets and asteroids have traditionally been separated categories, but main belt comets skew this view, portraying a possible intermediate stage between these two endmembers. Investigating the relationship between these bodies can improve our understanding of the formation and evolution of the Solar System and help to identify potentially interesting parent bodies from within our solar system, for future sample return missions. Furthermore, elucidating the ice-organic-silicate ratios of potential meteorite parent bodies can help to explain the observed isotopic ratios and petrography of meteorite samples. While the ice-organic-silicate ratios of particular bodies have been estimated, there has been no study undertaken which compares different types of bodies in terms of their ice-organic-silicate ratios. Therefore, this study presents a geophysical-chemical mass balance model, to estimate the ice-organic-silicate ratios of comets, main belt comets and asteroids. The results drawn from the model form a diagonal trend upon an ice-organic-silicate ternary diagram, in which comets and main belt comets plot together at generally higher ice contents, with asteroids typically plotting at lower ice contents. However, an overlap between all three body types is observed and supports the scenario in which comets, main belt comets and asteroids are genetically linked.

    DOI： 10.1093/mnras/stac1068

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  • Nitrogenous Altered Volcanic Glasses as Targets for Mars Sample Return: Examples From Antarctica and Iceland Reviewed

    M. P. Nikitczuk, G. E. Bebout, T. Ota, T. Kunihiro, J. F. Mustard, R. L. Flemming, R. Tanaka, S. A. Halldórsson, E. Nakamura

    Journal of Geophysical Research: Planets   127 ( 2 )   2022.2

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    Publishing type：Research paper (scientific journal)   Publisher：American Geophysical Union (AGU)  

    DOI： 10.1029/2021je007052

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    Other Link： https://onlinelibrary.wiley.com/doi/full-xml/10.1029/2021JE007052

  • Liquid-phase water isotope separation using graphene-oxide membranes Reviewed

    Karin Ching, Andy Baker, Ryoji Tanaka, Tingwen Zhao, Zhen Su, Rodney S. Ruoff, Chuan Zhao, Xianjue Chen

    Carbon   2022.1

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    Publishing type：Research paper (scientific journal)   Publisher：Elsevier {BV}  

    DOI： 10.1016/j.carbon.2021.10.009

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  • Mineralogical Factors Controlling the Ability to Retain 137Cs in Andosols in Japan Reviewed

    Atsushi Nakao, Shiori Uno, Ryoji Tanaka, Junta Yanai

    Behavior of Radionuclides in the Environment III   365 - 375   2022

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    Publishing type：Part of collection (book)   Publisher：Springer Singapore  

    DOI： 10.1007/978-981-16-6799-2_16

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  • Novel nickel isolation procedure for a wide range of sample matrices without using dimethylglyoxime for isotope measurements using MC-ICP-MS Reviewed International journal

    Dilan M. Ratnayake, Ryoji Tanaka, Eizo Nakamura

    Analytica Chimica Acta   1181   338934 - 338934   2021.10

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier {BV}  

    Nickel isotope ratios have traditionally been used as an important tracer in cosmochemistry, and recently, it has gained attention in geochemistry, biochemistry, and environmental sciences with the development of MC-ICP-MS. Purification of Ni before isotope measurement is mandatory for obtaining precise data, which has been commonly achieved with ion-exchange chromatography, employing dimethylglyoxime (DMG) as a chelating agent for Ni. However, it has been pointed out that the use of DMG can adversely affect the isotope measurement due to insufficient Ni recovery and mass bias during measurement caused by the remaining DMG. Ni isolation procedures without the usage of DMG were innovated, but they have disadvantages such as the necessity of complex separation methods, high Ni blank, and matrix-dependent Ni recovery. Here, we present a simple Ni isolation procedure without using DMG but with the aid of oxalic acid along with common inorganic acids, achieving near-complete recovery of Ni with low blanks [0.7 ± 0.3 ng (2SD, n = 4)] only using three ion exchange column steps. To validate our method and strengthen the Ni isotope database of reference materials, 60Ni/58Ni of 20 geological reference materials, covering wide matrix compositions, were measured by MC-ICP-MS using the double-spike method. The results have shown that high recovery of Ni, independent of the sample matrix elements was achieved (98 ± 4%) and the 60Ni/58Ni was measured with a 2SD of 0.006-0.084‰ from samples containing 100-200 ng Ni.

    DOI： 10.1016/j.aca.2021.338934

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  • A New Insight Into Seawater-Basalt Exchange Reactions Based on Combined δ18O—Δ′17O—87Sr/86Sr Values of Hydrothermal Fluids From the Axial Seamount Volcano, Pacific Ocean Reviewed

    Ryoji Tanaka

    Frontiers in Earth Science   2021.9

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    Publishing type：Research paper (scientific journal)  

    <jats:p>The δ<jats:sup>18</jats:sup>O values of submarine vent fluids are controlled by seawater-basalt exchange reactions, temperature of exchange, and to a lesser extent, by phase separation. These variations are translated into the δ<jats:sup>18</jats:sup>O values of submarine hydrothermal fluids between ca. 0 and + 4‰, a range defined by pristine seawater and equilibrium with basalt. Triple oxygen isotope systematics of submarine fluids remains underexplored. Knowing how δ<jats:sup>17</jats:sup>O and δ<jats:sup>18</jats:sup>O change simultaneously during seawater-basalt reaction has a potential to improve i) our understanding of sub-seafloor processes and ii) the rock-based reconstructions of ancient seawater. In this paper, we introduce the first combined δ<jats:sup>17</jats:sup>O-δ<jats:sup>18</jats:sup>O-<jats:sup>87</jats:sup>Sr/<jats:sup>86</jats:sup>Sr dataset measured in fluids collected from several high-temperature smoker- and anhydrite-type vent sites at the Axial Seamount volcano in the eastern Pacific Ocean. This dataset is supplemented by measurements of major, trace element concentrations and pH indicating that the fluids have reacted extensively with basalt. The salinities of these fluids range between 30 and 110% of seawater indicating that phase separation is an important process, potentially affecting their δ<jats:sup>18</jats:sup>O. The <jats:sup>87</jats:sup>Sr/<jats:sup>86</jats:sup>Sr endmember values range between 0.7033 and 0.7039. The zero-Mg endmember δ<jats:sup>18</jats:sup>O values span from -0.9 to + 0.8‰, accompanied by the Δ′<jats:sup>17</jats:sup>O<jats:sub>0.528</jats:sub> values ranging from around 0 to −0.04‰. However, the trajectory at individual site varies. The endmember values of fluids from focused vents exhibit moderate isotope shifts in δ′<jats:sup>18</jats:sup>O up to +0.8‰, and the shifts in Δ′<jats:sup>17</jats:sup>O are small, about −0.01‰. The diffuse anhydrite-type vent sites produce fluids that are significantly more scattered in δ′<jats:sup>18</jats:sup>O—Δ′<jats:sup>17</jats:sup>O space and cannot be explained by simple isothermal seawater-basalt reactions. To explain the observed variations and to provide constraints on more evolved fluids, we compute triple O isotope compositions of fluids using equilibrium calculations of seawater-basalt reaction, including a non-isothermal reaction that exemplifies complex alteration of oceanic crust. Using a Monte-Carlo simulation of the dual-porosity model, we show a range of possible simultaneous triple O and Sr isotope shifts experienced by seawater upon reaction with basalt. We show the possible variability of fluid values, and the causal effects that would normally be undetected with conventional δ<jats:sup>18</jats:sup>O measurements.</jats:p>

    DOI： 10.3389/feart.2021.691699

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  • Silicon and Oxygen Isotope Evolution of the Inner Solar System Reviewed

    Ryoji Tanaka, Christian Potiszil, Eizo Nakamura

    The Planetary Science Journal   2 ( 3 )   102 - 102   2021.6

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：American Astronomical Society  

    DOI： 10.3847/PSJ/abf490

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  • Distance-dependence from volcano for Asian dust inclusions in Andosols: A key to control soil ability to retain radiocesium Reviewed

    Atsushi Nakao, Shiori Uno, Junta Yanai, Hideo Kubotera, Ryoji Tanaka, Robert A. Root, Takashi Kosaki

    Geoderma   385   114889 - 114889   2021.3

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    Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.geoderma.2020.114889

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  • Comment on: ‘A simple cryogenic method for efficient measurement of triple oxygen isotopes in silicates’ by Ghoshmaulik et al. (Rapid Commun Mass Spectrom. 2020;34(18):e8833) Reviewed

    Martin F. Miller, Ryoji Tanaka, Richard C. Greenwood

    Rapid Communications in Mass Spectrometry   34 ( 22 )   2020.11

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    Publishing type：Research paper (scientific journal)   Publisher：Wiley  

    DOI： 10.1002/rcm.8913

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  • The Albedo of Ryugu: Evidence for a High Organic Abundance, as Inferred from the Hayabusa2 Touchdown Maneuver Reviewed

    Christian Potiszil, Ryoji Tanaka, Katsura Kobayashi, Tak Kunihiro, Eizo Nakamura

    ASTROBIOLOGY   20 ( 7 )   916 - 921   2020.6

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1089/ast.2019.2198

    Web of Science

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  • Concentration of meteoritic free organic matter by fluid transport and adsorption Reviewed

    Christian Potiszil, Ryoji Tanaka, Tsutomu Ota, Tak Kunihiro, Katsura Kobayashi, Eizo Nakamura

    Geochemical Perspectives Letters   13   30 - 35   2020.3

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.7185/geochemlet.2010

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  • Triple oxygen isotope systematics as a tracer of fluids in the crust: A study from modern geothermal systems of Iceland Reviewed

    D.O. Zakharov, I.N. Bindeman, R. Tanaka, G.Ó. Friðleifsson, M.H. Reed, R.L. Hampton

    Chemical Geology   530   119312 - 119312   2019.12

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier {BV}  

    DOI： 10.1016/j.chemgeo.2019.119312

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  • Tourmaline in a Mesoarchean pelagic hydrothermal system: Implications for the habitat of early life Reviewed

    Tsutomu Ota, Yuhei Aihara, Shoichi Kiyokawa, Ryoji Tanaka, Eizo Nakamura

    Precambrian Research   334   105475 - 105475   2019.11

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.precamres.2019.105475

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  • Transition from plume-driven to plate-driven magmatism in the evolution of the Main Ethiopian Rift Reviewed

    Ryoji Tanaka

    Journal of Petrology   2019.9

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    Language：English   Publishing type：Research paper (scientific journal)  

    &lt;jats:title&gt;Abstract&lt;/jats:title&gt;<br />
    &lt;jats:p&gt;New K-Ar ages, major and trace element concentrations, and Sr-Nd-Pb isotope data are presented for Oligocene to recent mafic volcanic rocks from the Ethiopian Plateau, the Main Ethiopian Rift (MER), and the Afar depression. Chronological and geochemical data from this study are combined with previously published data sets to reveal secular variations in magmatism throughout the entire Ethiopian volcanic region. The mafic lavas in these regions show variability in terms of silica-saturation (i.e., alkaline and sub-alkaline series) and extent of differentiation (mafic through intermediate to felsic). The P-T conditions of melting, estimated using the least differentiated basalts, reveal a secular decrease in the mantle potential temperature, from when the flood basalt magmas erupted (up to 1550 °C) to the time of the rift-related magmatism (&amp;lt;1500 °C). Variations in the Sr-Nd-Pb isotopic compositions of the mafic lavas can account for the involvement of multiple end-member components. The relative contributions of these end-member components vary in space and time owing to changes in the thermal condition of the asthenosphere and the thickness of the lithosphere. The evolution of the Ethiopian rift is caused by a transition from plume-driven to plate-driven mantle upwelling, although the present-day mantle beneath the MER and the Afar depression is still warmer than normal asthenosphere.&lt;/jats:p&gt;

    DOI： 10.1093/petrology/egz043

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  • Asian dust increases radiocesium retention ability of serpentine soils in Japan. Reviewed International journal

    Nakao A, Tomita M, Wagai R, Tanaka R, Yanai J, Kosaki T

    Journal of environmental radioactivity   204   86 - 94   2019.8

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    DOI： 10.1016/j.jenvrad.2019.03.028

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  • Origin of ocean island basalts in the West African passive margin without mantle plume involvement Reviewed

    Iyasu Getachew Belay, Ryoji Tanaka, Hiroshi Kitagawa, Katsura Kobayashi, Eizo Nakamura

    Nature Communications   10 ( 1 )   3022   2019.7

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    DOI： 10.1038/s41467-019-10832-7

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  • A Method to Suppress Isobaric and Polyatomic Interferences for Measurements of Highly Siderophile Elements in Desilicified Geological Samples Reviewed

    Xiaoyu Zhou, Ryoji Tanaka, Masahiro Yamanaka, Chie Sakaguchi, Eizo Nakamura

    Geostandards and Geoanalytical Research   43 ( 4 )   611 - 633   2019.7

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    DOI： 10.1111/ggr.12280

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  • Hypervelocity collision and water-rock interaction in space preserved in the Chelyabinsk ordinary chondrite Reviewed

    Nakamura E, Kunihiro T, Ota T, Sakaguchi C, Tanaka R, Kitagawa H, Kobayashi K, Yamanaka M, Shimaki Y, Bebout GE, Miura H, Yamamoto T, Malkovets V, Grokhovsky V, Koroleva O, Litasov K

    Proceedings of the Japan Academy. Series B, Physical and biological sciences   95 ( 4 )   165 - 177   2019.4

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    DOI： 10.2183/pjab.95.013

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  • The origin of the unique achondrite Northwest Africa 6704: Constraints from petrology, chemistry and Re–Os, O and Ti isotope systematics Reviewed

    Yuki Hibiya, Gregory J. Archer, Ryoji Tanaka, Matthew E. Sanborn, Yuya Sato, Tsuyoshi Iizuka, Kazuhito Ozawa, Richard J. Walker, Akira Yamaguchi, Qing-Zhu Yin, Tomoki Nakamura, Anthony J. Irving

    Geochimica et Cosmochimica Acta   245   597 - 627   2019.1

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    DOI： 10.1016/j.gca.2018.04.031

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  • Circa 1 Ga sub-seafloor hydrothermal alteration imprinted on the Horoman peridotite massif Reviewed

    Lalindra V. Ranaweera, Tsutomu Ota, Takuya Moriguti, Ryoji Tanaka, Eizo Nakamura

    Scientific Reports   8 ( 1 )   1 - 12   2018.6

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    DOI： 10.1038/s41598-018-28219-x

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  • Silicate-SiO reaction in a protoplanetary disk recorded by oxygen isotopes in chondrules Reviewed

    Ryoji Tanaka, Eizo Nakamura

    NATURE ASTRONOMY   1 ( 7 )   1 - 7   2017.7

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    DOI： 10.1038/s41550-017-0137

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  • The oxygen isotope composition of San Carlos olivine on the VSMOW2-SLAP2 scale Reviewed

    Andreas Pack, Ryoji Tanaka, Markus Hering, Sukanya Sengupta, Stefan Peters, Eizo Nakamura

    RAPID COMMUNICATIONS IN MASS SPECTROMETRY   30 ( 13 )   1495 - 1504   2016.7

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    DOI： 10.1002/rcm.7582

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  • Aeolian-Dust-Derived Micaceous Minerals Control Radiocesium Retention in Andosols in Japan Reviewed

    Atsushi Nakao, Aya Nakao, Ryoji Tanaka, Sho Ogasawara, Junta Yanai

    SOIL SCIENCE SOCIETY OF AMERICA JOURNAL   79 ( 6 )   1590 - 1600   2015.11

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    DOI： 10.2136/sssaj2015.05.0173

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  • Evaluation of the applicability of acid leaching for the U-238-Th-230 internal isochron method Reviewed

    Ryoji Tanaka, Tetsuya Yokoyama, Hiroshi Kitagawa, Demissie Bizuneh Tesfaye, Eizo Nakamura

    CHEMICAL GEOLOGY   396   255 - 264   2015.3

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    DOI： 10.1016/j.chemgeo.2014.12.025

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  • Oxygen isotopes in Indian Plate eclogites (Kaghan Valley, Pakistan): Negative delta O-18 values from a high latitude protolith reset by Himalayan metamorphism Reviewed

    Hafiz Ur Rehman, Ryoji Tanaka, Patrick J. O'Brien, Katsura Kobayashi, Tatsuki Tsujimori, Eizo Nakamura, Hiroshi Yamamoto, Tahseenullah Khan, Yoshiyuki Kaneko

    LITHOS   208   471 - 483   2014.11

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    DOI： 10.1016/j.lithos.2014.09.007

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  • Two new eucrite breccias from Northwest Africa Reviewed

    Sheryl A. Singerling, Aubrey L. Modi, Blake McFerrin, Emily A. Worsham, Harry Y. McSween, Douglas Rumble, Ryoji Tanaka, Lawrence A. Taylor

    METEORITICS & PLANETARY SCIENCE   48 ( 2 )   E1 - E9   2013.2

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    DOI： 10.1111/maps.12025

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  • Determination of 17O-excess of terrestrial silicate/oxide minerals with respect to Vienna Standard Mean Ocean Water (VSMOW) Reviewed

    Ryoji Tanaka, Eizo Nakamura

    RAPID COMMUNICATIONS IN MASS SPECTROMETRY   27 ( 2 )   285 - 297   2013.1

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1002/rcm.6453

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  • Inherited Pb isotopic records in olivine antecryst-hosted melt inclusions from Hawaiian lavas Reviewed

    Patrick Asamoah Sakyi, Ryoji Tanaka, Katsura Kobayashi, Eizo Nakamura

    GEOCHIMICA ET COSMOCHIMICA ACTA   95   169 - 195   2012.10

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    DOI： 10.1016/j.gca.2012.07.025

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  • PETROLOGIC, ELEMENTAL AND OXYGEN ISOTOPIC CHARACTERIZATION OF HIGHLY ENRICHED MAFIC SHERGOTTITE NORTHWEST AFRICA 7257 Reviewed

    A. J. Irving, S. M. Kuehner, G. Chen, C. D. K. Herd, R. Tanaka, D. A. Gregory

    METEORITICS & PLANETARY SCIENCE   47   A209 - A209   2012.7

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  • Space environment of an asteroid preserved on micrograins returned by the Hayabusa spacecraft Reviewed

    Eizo Nakamura, Akio Makishima, Takuya Moriguti, Katsura Kobayashi, Ryoji Tanaka, Tak Kunihiro, Tatsuki Tsujimori, Chie Sakaguchi, Hiroshi Kitagawa, Tsutomu Ota, Yusuke Yachi, Toru Yada, Masanao Abe, Akio Fujimura, Munetaka Ueno, Toshifumi Mukai, Makoto Yoshikawa, Jun'ichiro Kawaguchi

    PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA   109 ( 11 )   E624 - E629   2012.3

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    DOI： 10.1073/pnas.1116236109

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  • The influence of aeolian dust in non-allophanic Andosols on Yakushima Island Reviewed

    Tetsuya Eguchi, Ryoji Tanaka, Yuji Maejima, Kenji Tamura

    SOIL SCIENCE AND PLANT NUTRITION   58 ( 2 )   191 - 199   2012

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    DOI： 10.1080/00380768.2012.672926

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  • Establishment of comprehensive analytical system for terrestrial and extraterrestrial materials behind the Initial analysis of particles from an asteroid, Itokawa, returned by Hayabusa Spacecraft Invited Reviewed

    Nakamura, E., Makishima, A., Moriguti, T., Kobayashi, K., Tanaka, R., Kunihiro, T., Tsujimori, T.

    Journal of the Surface Science Society of Japan (Hyomen Kagaku)   33 ( 12 )   681 - 686   2012

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    DOI： 10.1380/jsssj.33.681

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  • NORTHWEST AFRICA 6704: A UNIQUE CUMULATE PERMAFIC ACHONDRITE CONTAINING SODIC FELDSPAR, AWARUITE AND "FLUID" INCLUSIONS, WITH AN OXYGEN ISOTOPIC COMPOSITION IN THE ACAPULCOITE-LODRANITE FIELD Reviewed

    A. J. Irving, R. Tanaka, A. Steele, S. M. Kuehner, T. E. Bunch, J. H. Wittke, G. M. Hupe

    METEORITICS & PLANETARY SCIENCE   46   A108 - A108   2011.7

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  • Sr-Nd-Hf-Pb isotopic characteristics of North-Western and Southern Ethiopian lithospheric mantle Reviewed

    A. Melesse, T. Kunihiro, T. Ota, R. Tanaka, T. Moriguti, E. Nakamura

    GEOCHIMICA ET COSMOCHIMICA ACTA   74 ( 12 )   A697 - A697   2010.6

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  • Precise Elemental and Isotopic Analyses in Silicate Samples Employing ICP-MS: Application of Hydrofluoric Acid Solution and Analytical Techniques Reviewed

    Akio Makishima, Ryoji Tanaka, Eizo Nakamura

    ANALYTICAL SCIENCES   25 ( 10 )   1181 - 1187   2009.10

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  • CONFIRMATION OF epsilon(CR)-C-54-Delta O-17 CORRELATION IN BULK CARBONACEOUS CHONDRITES AND ITS ASTROPHYSICAL SIGNIFICANCE Reviewed

    Qing-Zhu Yin, K. Yamashita, A. Yamakawa, R. Tanaka, E. Nakamura, A. N. Krot, B. S. Meyer

    METEORITICS & PLANETARY SCIENCE   44   A224 - A224   2009.7

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  • Comprehensive analysis for major, minor and trace element contents and Sr-Nd-Pb-Hf isotope ratios in sediment reference materials, JSd-1 and MAG-1

    B. Nagender Nath, Akio Makishima, Janine Noordmann, Ryoji Tanaka, Eizo Nakamura

    GEOCHEMICAL JOURNAL   43 ( 3 )   207 - 216   2009

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    DOI： 10.2343/geochemj.1.0018

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  • Lead isotope systematics of olivine-hosted melt inclusions from Hawaiian lavas Reviewed

    R. Tanaka, P. A. Sakyi, K. Kobayashi, E. Nakamura

    GEOCHIMICA ET COSMOCHIMICA ACTA   72 ( 12 )   A930 - A930   2008.7

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  • aEvolution of the Southern Ethiopian Rift System: Constrained from geochronological and geochemical data of mafic lavas of Amaro and Yabello areas Reviewed

    D. B. Tesfaye, R. Tanaka, E. Nakamura

    GEOCHIMICA ET COSMOCHIMICA ACTA   72 ( 12 )   A942 - A942   2008.7

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  • Dislocation microstructures in naturally deformed olivine crystals from Hawaiian lavase Reviewed

    P. A. Sakyi, R. Tanaka, E. Nakamura

    GEOCHIMICA ET COSMOCHIMICA ACTA   72 ( 12 )   A819 - A819   2008.7

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  • Hawaiian double volcanic chain triggered by an episodic involvement of recycled material: Constraints from temporal Sr-Nd-Hf-Pb isotopic trend of the Loa-type volcanoes Reviewed

    Ryoji Tanaka, Akio Makishima, Eizo Nakamura

    EARTH AND PLANETARY SCIENCE LETTERS   265 ( 3-4 )   450 - 465   2008.1

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    DOI： 10.1016/j.epsl.2007.10.035

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  • Forsterite-rich and Ca-poor olivine phenocryst crystallized by polybaric melting in a subduction zone Reviewed

    R. Tanaka, E. Nakamura

    GEOCHIMICA ET COSMOCHIMICA ACTA   71 ( 15 )   A998 - A998   2007.8

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  • Recent and episodic addition to the Hawaiian plume activity Reviewed

    R. Tanaka, A. Makishima, E. Nakamura

    GEOCHIMICA ET COSMOCHIMICA ACTA   70 ( 18 )   A636 - A636   2006.8

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  • Boron isotopic constraints on the source of Hawaiian shield lavas Reviewed

    R Tanaka, E Nakamura

    GEOCHIMICA ET COSMOCHIMICA ACTA   69 ( 13 )   3385 - 3399   2005.7

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    DOI： 10.1016/j.gca.2005.03.009

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  • Lithium, boron, and lead isotope systematics of glass inclusions in olivines from Hawaiian lavas: evidence for recycled components in the Hawaiian plume Reviewed

    K Kobayashi, R Tanaka, T Moriguti, K Shimizu, E Nakamura

    CHEMICAL GEOLOGY   212 ( 1-2 )   143 - 161   2004.11

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    DOI： 10.1016/j.chemgeo.2004.08.050

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  • Boron isotopic composition of Hawaiian shield lavas Reviewed

    R Tanaka, E Nakamura

    GEOCHIMICA ET COSMOCHIMICA ACTA   68 ( 11 )   A46 - A46   2004.6

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  • Suppression of Zr, Nb, Hf and Ta coprecipitation in fluoride compounds for determination in Ca-rich materials Reviewed

    R Tanaka, A Makishima, H Kitagawa, E Nakamura

    JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY   18 ( 12 )   1458 - 1463   2003.12

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    DOI： 10.1039/b309948b

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  • Suppression of Zr, Nb, HF, and Ta co-precipitation during HF digestion of Ca-rich geological materials Reviewed

    R Tanaka, H Kitagawa, A Makishima, E Nakamura

    GEOCHIMICA ET COSMOCHIMICA ACTA   67 ( 18 )   A475 - A475   2003.9

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  • Evolution of an isotopically depleted mantle xenolith from salt lake crater, Hawaii Reviewed

    E Nakamura, C Sakaguchi, R Tanaka, T Moriguti, Kushiro, I

    GEOCHIMICA ET COSMOCHIMICA ACTA   67 ( 18 )   A324 - A324   2003.9

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  • Lithium, boron and lead isotope systematics on glass inclusions in olivine phenocrysts from Hawaiian lavas Reviewed

    K Kobayashi, R Tanaka, T Moriguti, K Shimizu, E Nakamura

    GEOCHIMICA ET COSMOCHIMICA ACTA   67 ( 18 )   A223 - A223   2003.9

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  • Comprehensive geochemical analyses of small amounts (100mg) of extraterrestrial samples for the analytical competition related to the sample-return mission, MUSES-C. Reviewed

    Nakamura E, Makishima A, Moriguti T, Kobayashi K, Sakaguchi C, Yokoyama T, Tanaka R, Kuritani T, Takei H

    The Institute of Space and Astronautical Science report. S.P.   16   49 - 101   2003

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    We have participated in the analytical competition related to the sample-return mission, MUSES-C of the ISAS, to be launched in May 2003 and returned in summer 2007. In this competition, we have determined major and trace element abundances and isotopes (as many as possible), both for two powdered samples provided by the ISAS and for chondrules separated from Allende meteorite as an additional demonstration of our high-spatial resolution analytical capabilities for fragment samples. 100 mg of each of the competition samples, 1C and 2C, were split into two fractions of approximately 30 and 70 mg for the determinations of elemental abundances and the isotope analyses, respectively. The bulk concentrations of 55 elements in each 30 mg sample were analyzed by quadruple-type ICP-MS and sector-type ICP-MS with analytical uncertainties better than 10 percent (1 sigma). B, Pb, Li, Rb, Sr, Sm and Nd were successively separated from the remaining 70 mg of each of the samples, using a novel integrated, multi-ion exchange column chemistry approach, and then the isotopes of these elements were successfully determined by TIMS with analytical errors similar to those for analyses of terrestrial samples. The Sr, Nd, Re and Os isotopic compositions were also analyzed using the remaining aliquots of the sample solutions for trace element analyses by ICP-MS. The results obtained in this study indicate that 1C and 2C samples are probably ordinary chondrite and the Allende meteorite, respectively. However, extreme W, Ta and Nb enrichments in the 1C were probably caused by contamination during sample preparation. Furthermore, both of the samples were extensively contaminated by B from the borosilicate glass container in which the samples were delivered. Five chondrules were separated from Allende meteorite and then sliced into three pieces using a dicing saw. The center slices were used to petrographically determine the mineral phases, compositionally map these phases by SEM-EDX, and obtain quantitative major and trace element compositions (30 elements) by SEM-EDX and ion microprobe. The two outer slices, for which sample masses were less than 1 mg, were chemically treated to obtain the bulk trace elements and isotope compositions of the chondrules. For the chondrule slices, 24 trace elements and Sr and Nd isotopic compositions were determined with extremely small analytical uncertainties by ICP-MS and TIMS (for Sr and Nd, respectively). Based on the analytical experience, including this competition, we believe that all of the analyses carried out could have been completed within 50 days if we could have concentrated on this project alone during that 50-day period. In this report, we describe the analytical techniques employed for the powdered samples and the chondrules, and we present all of the results obtained during the approximately 3-month period of the analytical competition.

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  • Re-Os age of molybdenite from the Busetsu two-mica granite, central Japan

    Bulletin of the Geological Survey of Japan   53 ( 5 )   479 - 482   2002

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  • Geochemical evolution of koolau volcano. Hawaii Reviewed

    Ryoji Tanaka, Eizo Nakamura, Eiichi Takahashi

    Geophysical Monograph Series   128   311 - 332   2002

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    DOI： 10.1029/GM128p0311

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  • An end-member component of Hawaiian mantle plume presented by a xenolith from Salt Lake Crater, Hawaii?

    NAKAMURA Eizo, SAKAGUCHI Chie, TANAKA Ryoji, MORIGUTI Takuya, KUSHIRO Ikuo

    Abstracts of Papers Presented at the Annual Meeting of The Japanese Association of Mineralogists, Petrologists and Economic Geologists   2002   251 - 251   2002

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    DOI： 10.14824/jampeg.2002.0.251.0

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  • Paired Sulfur Isotopic Belts: Late Cenozoic Ore Deposits of Southwest Japan

    ISHIHARA S.

    Bulletin of the Geological Survey of Japan   51 ( 7 )   283 - 297   2000

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  • The discovery of Indo-Sinian granites in Manzhouli area : Evidence from Rb-Sr isochrons

    QIN K. Z.

    Acta Petrol. Mineral.   17   235 - 240   1998

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  • The timing and geneses of ilmeniteーseries and magnetiteーseries granitic magmatism in the northーcentral Hokkaido,Japan

    Bulletin of the Geological Survey of Japan   49 ( 12 )   605 - 620   1998

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  • Sr and Nd isotopic data for the seven GSJ rock reference samples; JA-1, JB-1a, JB-2, JB-3, JG-1a, JGb-1 and JR-1 Reviewed

    Y Orihashi, J Maeda, R Tanaka, R Zeniya, K Niida

    GEOCHEMICAL JOURNAL   32 ( 3 )   205 - 211   1998

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  • Chemical and mineralogical characteristics of the Kanamaru pegmatite deposit, Niigata Prefecture, Japan

    NANBU A.

    Resource Geol.   47   1 - 10   1997

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  • XRF analysis of major and trace elements for silicate rocks using low dilution ratio fused glass

    TANAKA R.

    HUEPS Technical Report.   2   1 - 20   1997

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  • Sondeos subterráneos sin excavacíon en El Salvador. Antología de Chalchuapa.

    Tanaka, Y, Tanaka, R, Itami, A, O'Neil

    Universidad de Estudios Extranjeros de Kyoto.   36 - 50   1997

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  • Magnetic susceptibility of late Cenozoic volcanic rocks of east-central Hokkaido and the Kuril Island.

    Ishihara, S, Tanaka, R, Nakagawa, M, Goto, Y

    Resource Geology Special Issue   18   217 - 228   1995

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MISC

  • Detection of Meteoritic Amino Acids in Extremely Small Sample Sizes: Implications for Sample Return Missions

    Christian Potiszil, Masahiro Yamanaka, Tsutomu Ota, Ryoji Tanaka, Katsura Kobayashi, Eizo Nakamura

    Preprints   2023.3

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    Publisher：MDPI AG  

    Unmetamorphosed carbonaceous chondrites provide important information concerning the formation and evolution of organic matter, such as amino acids. However, terrestrial contamination remains a valid concern when investigating the organic inventory of meteorites that have fallen to Earth. Accordingly, JAXA&amp;rsquo;s Hayabusa2 and NASA&amp;rsquo;s OSIRIS-REx have been launched with the task of returning uncontaminated C-type asteroid material to Earth. The successful Hayabusa2 mission has a very limited sample size (5.4 g). Therefore, many conventional compound specific techniques will struggle to detect amino acids above detection limit with available sample amounts (~several mg to 10&amp;rsquo;s of mg) being much smaller than those typically used. Here a novel method utilizing ultrahigh performance liquid chromatography-Orbitrap-mass spectrometry is validated and applied to very small meteorite samples, thus providing an approach that can overcome the small sample size constraints of sample return missions. The method is highly sensitive, enabling the detection of amino acids in the carbonaceous chondrites Murchison (2.28 mg) and Orgueil (2.30 mg). Furthermore, quantitation was possible for many of the detected amino acids in Murchison and Orgueil. Using the data presented here, both the amino acid reservoirs of Murchison and Orgueil and the potential application of this method to sample return samples are discussed.

    DOI： 10.20944/preprints202302.0374.v2

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  • 最終氷期の古植生変遷期に堆積した泥炭層に含まれる無機粒子の組成解析

    中尾淳, 田中佑樹, 高原光, 田中亮吏, 矢内純太

    日本土壌肥料学会講演要旨集(Web)   66   2020

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  • 黄砂がもたらす蛇紋岩アノマリーの緩和効果

    中尾淳, 片岡純佳, 富田真悠, 山崎慎一, 田中亮吏, 和穎朗太, 矢内純太

    日本土壌肥料学会講演要旨集   64   81   2018.8

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  • 10.1038/s41598-018-28219-x

    8   1 - 12   2018

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  • 酸素同位体比とK‐Ar年代を利用した火山灰‐黄砂混合比の推定

    中尾淳, 寺島真惟, ELLIOTT Crawford, WAMPLER Marion, 田中亮吏, 矢内純太

    日本地球惑星科学連合大会予稿集(Web)   2018   ROMBUNNO.MIS14‐10 (WEB ONLY)   2018

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  • 地球惑星物質総合解析システムの構築と応用

    中村栄三, 牧嶋昭夫, 森口拓弥, 小林桂, 田中亮吏, 国広卓也, 北川宙, 太田努, 坂口千恵, 山中正博

    法政大学イオンビーム工学研究所シンポジウム講演予稿集   36th   2017

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  • Boron isotope constraints on the source of Hawaiian shield lavas

    TANAKA Ryoji, NAKAMURA Eizo

    2004   232 - 232   2004.9

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  • Lithium, Boron and Lead Isotope Systematics of Glass Inclusions in Olivines from Hawaiian Lavas : Evidence for Recycled Components in the Hawaiian Plume

    KOBAYASHI Katsura, TANAKA Ryoji, MORIGUTI Takuya, SHIMIZU Kenji, NAKAMURA Eizo

    2004   186 - 186   2004.9

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  • 領家帯最高変成時期における火成活動の特徴

    田中亮吏

    月刊地球   号外30号   64 - 69   2000

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Presentations

  • Constraining the processes responsible for the origin and evolution of extraterrestrial organic matter: evidence from the asteroid Ryugu

    Christian Potiszil, Katsura Kobayashi, Ryoji Tanaka, Tak Kunihiro, Hiroshi Kitagawa, Tsutomu Ota, Masahiro Yamanaka, Chie Sakaguchi, Eizo Nakamura

    Goldschmidt 2023 Conference  2023.7.10 

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    Language：English   Presentation type：Oral presentation (general)  

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  • Aqueous alteration on the progenitor body of the asteroid Ryugu revealed through HCNO isotope systematics

    Ryoji Tanaka, Christian Potiszil, Tsutomu Ota, Tak Kunihiro, Chie Sakaguchi, Katsura Kobayashi, Hiroshi Kitagawa, Masahiro Yamanaka, Eizo Nakamura

    Goldschmidt 2023 Conference  2023.7.10 

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    Event date： 2023.7.9 - 2023.7.14

    Language：English   Presentation type：Oral presentation (general)  

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  • Development of a sequential ion exchange chromatography method to separate geochemically important tracers for isotope measurements

    Ratnayake Mudiyanselage Dilan, Madusanka Ratnayake, Ryoji Tanaka, Eizo Nakamura

    Goldschmidt 2023 Conference 

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    Event date： 2023.7.9 - 2023.7.14

    Language：English   Presentation type：Poster presentation  

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  • Organic Matter from the Asteroid Ryugu: Implications for the Origin of Life and Asteroidal Processes.

    Christian Potiszil, Katsura Kobayashi, Ryoji Tanaka, Tak Kunihiro, Hiroshi Kitagawa, Tsutomu Ota, Chie Sakaguchi, Masa Yamanaka, Eizo Nakamura

    AGU Fall Meeting 2022  2022.12 

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    Event date： 2022.12

    Language：English   Presentation type：Oral presentation (general)  

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  • Characteristics and the distribution of source materials for OIB at the West African passive margin

    Goldschmidt 2017  2017 

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  • Enstatite chondrite chondrules explain the oxygen isotope variation of building blocks of inner planetary embryos

    4th International Geoscience Symposium Precambrian World 2017  2017 

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  • Gas-melt reaction in the reduced nebula environment revealed by oxygen isotope of EH chondrites

    Goldschmidt meeting 2016  2016 

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  • Fractionation behavior of 238U-series nuclides during acid leaching of basaltic samples

    2016 

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  • Gas-melt reaction in the reduced nebula environment revealed by oxygen isotope of EH chondrites

    Goldschmidt meeting 2016  2016 

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  • Fractionation behavior of 238U-series nuclides during acid leaching of basaltic samples

    Misasa VI “Frontiers in Earth and Planetary Materials Research: Origin, Evolution and Dynamics”  2016 

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  • 53Mn-53Cr systematics of Allende chondrules and ε54Cr―Δ17O correlation in bulk carbonaceous chondrites

    Yin, Q. Z, Yamashita, K, Yamakawa, A, Tanaka, R, Jacobsen, B, Ebel, D, Hutcheon, I. D, Nakamura, E

    40th Lunar and Planetary Science Conference  2009 

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  • Evolution of Hawaiian shield volcano revealed by antecryst-hosted melt inclusions

    American Geophysical Union 2009 Fall Meeting  2009 

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  • Chemical Structure of the Hawaiian Plume and Formation of the Double Volcanic Chain

    MISASA‐3 "Origin, Evolution and Dynamics of the Earth: a tribute to Eiji Ito" 2007/03/21-23  2008 

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  • Chemical structure of the Hawaiian plumeand its 0 - 3 Ma evolution

    日本地球惑星科学連合2008年大会  2008 

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  • Lead isotope systematics of olivine-hosted melt inclusions from Hawaiian lavas

    Goldschmidt conference  2008 

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  • Dislocation microstructures in naturally deformed olivine crystals from Hawaiian lavase

    Goldschmidt conference  2008 

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  • Evolution of the Southern Ethiopian Rift System: Constrained from geochronological and geochemical data of mafic lavas of Amaro and Yabello areas

    Goldschmidt Conference  2008 

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  • Forsterite-rich and Ca-poor olivine phenocryst crystallized by polybaric melting in a subduction zone

    17th V.M.Goldshmidt Conference  2007 

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  • Phanerozoic Crustal Growth Constrained by Zircon U-Pb Age and Sr-Nd-Hf Isotopic Evidence from the Granitoid Rocks in Mongolia

    17th V.M.Goldschmidt Conference  2007 

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  • Intra-shield geochemical evolution of the Hawaiian volcano as inferred from the Hf isotope systematics of the Koolau shield

    2nd International Symposium Misasa, The Evolution of Early Stage of Earth and Solar System  2006 

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  • Recent and episodic addition to the Hawaiian plume activity

    16th V.M.Goldschmidt Conference  2006 

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  • Source heterogeneity versus crustal assimilation or post-magmatic contamination for the Hawaiian shield lavas.

    COE-21 International Symposium Misasa, Origin, Evolution, and Dynamics of the Earth –Present & Future Research-  2005 

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  • The Rajmahal flood basalt province, northern India; constraints on its temporal definition and petrogenesis.

    COE-21 International Symposium Misasa, Origin, Evolution, and Dynamics of the Earth –Present & Future Research-  2005 

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  • ホウ素同位体を用いた岩石－水相互作用の評価

    資源素材学会年会  2005 

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  • Boron isotopic composition of Hawaiian shield lavas.

    14th V.M.Goldschmidt Conference  2004 

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  • ハワイ・シールドステージマグマ起源物質のホウ素同位体による制約

    日本岩石鉱物鉱床学会2004年学術講演  2004 

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  • Suppression of Zr, Nb, Hf, and Ta Co-precipitation during HF Digestion of Ca-rich Geological Materials.

    13th V.M.Goldschmidt Conference  2003 

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  • Lithium, Boron, and Lead Isotope Systematics on Glass Inclusions in Olivine Phenocrysts from Hawaiian Lavas.

    13th V.M.Goldschmidt Conference  2003 

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  • Evolution of an Isotopically Depleted Mantle Xenolith from Salt Lake Crater, Hawaii.

    13th V.M.Goldschmidt Conference  2003 

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Industrial property rights

  • 試料中の微量元素を測定する方法、微量元素とフッ化物との共沈を抑制する方法

    田中亮吏・北川宙・牧嶋昭夫・中村栄三

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    Application no：特願2003-204828  Date applied：2003.7.3

    Patent/Registration no：3755039 

Research Projects

  • Reassessment of soil formation processes using precise quantification of minerals and multi-tracer estimation of their provenances.

    Grant number：25K01923  2025.04 - 2028.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    中尾 淳, 矢内 純太, 田中 亮吏, 黒川 耕平

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    Grant amount：\18850000 （ Direct expense: \14500000 、 Indirect expense：\4350000 ）

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  • Assessing the potential sources of the pre-biotic building blocks of life via an interdisciplinary experimental and analytical approach

    Grant number：24KK0078  2024.09 - 2028.03

    Japan Society for the Promotion of Science  Fund  International Joint Research Acceleration Fund (Overseas Collaborative Research)

    Ryoji Tanaka, Potiszil Christian, Trishit Ruj, Eloïse Céline Brown

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    Grant amount：\20930000 （ Direct expense: \16100000 、 Indirect expense：\4830000 ）

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  • Development of site-specific stable isotope analysis to elucidate the origin and evolution of extraterrestrial amino acids

    Grant number：24K00745  2024.04 - 2027.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    田中 亮吏, Potiszil Christian

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    Grant amount：\18590000 （ Direct expense: \14300000 、 Indirect expense：\4290000 ）

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  • Development of a method for detecting traces of biological activity using multi-transition metal stable isotopes

    Grant number：23K17707  2023.06 - 2026.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Research (Exploratory)

    田中 亮吏, 山中 正博

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    Grant amount：\6240000 （ Direct expense: \4800000 、 Indirect expense：\1440000 ）

    本課題では、地球外物質や初期地球物質から生命の痕跡を探査するための基礎的研究を行う。水素、窒素、炭素などの安定同位体は、生命代謝活動による特有の同位体分別を生じるため、生命痕跡探査の強力なツールとなり得る。しかし、これらの元素の同位体比は変質反応や光化学反応等による二次的改変が生じている可能性があるため、これらの影響が少ないとされる遷移金属元素の安定同位体を用いて、生命・非生命起源分別過程を判読するためのツールを開発する。本研究では、質量分析計を用いた遷移金属元素同位体分析方法の高精度化、様々な条件下で行うシアノバクテリア培養実験、および天然試料の分析を中心に研究を行い、主に遷移金属元素を用いた生命・非生命反応過程の解析を目的とする。
    2023年度は、地質試料中から、第一遷移元素金属のうち複数の安定同位体を持つ、チタン、バナジウム、クロム、鉄、ニッケル、銅、および関連する元素として、亜鉛、ガリウムをイオン交換法により連続的に分離する方法を開発した。さらに、すでに研究代表者と研究協力者により開発したクロム、ニッケル同位体分析法に加え、銅、亜鉛、ガリウム同位体分析法を開発した。地球大気への酸素供給源として重要な役割を果たすシアノバクテリアの培養実験も行い、模擬太古代海水中の遷移元素金属量を変化させた条件でのシアノバクテリアの増殖率と代謝活動の影響を考察した。このほか、クロム同位体が記録する、鉱物‐流体反応過程に関する研究も行った。

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  • Development of multi-elements triple stable isotope measurements and its application

    Grant number：20K04108  2020.04 - 2023.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    Tanaka Ryoji

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    Grant amount：\4290000 （ Direct expense: \3300000 、 Indirect expense：\990000 ）

    High-precision isotopic measurements for oxygen, silicon, magnesium, calcium, nickel, and chromium were developed, and these methods were applied to the study of gas-melt reaction processes in the inner region of the protoplanetary disk, submarine hydrothermal system, the formation of the parent body of the asteroid Ryugyu, etc. In this project, multi-element isotopes were mainly used for these studies. In addition, the possibility to discriminate the equilibrium and kinetic isotope effects based on the relationship between two isotope ratios. With current analytical precision, only oxygen isotopes are applicable, and further improvement of analytical precision is required for the use of other elements.

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  • Development of high precision chronological method for the determination of volcanic eruption

    Grant number：16K05578  2016.04 - 2019.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    Tanaka Ryoji, Zhou Xiaoyu, Getachew Belay Iyasu

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    Grant amount：\4550000 （ Direct expense: \3500000 、 Indirect expense：\1050000 ）

    To apply the high-precision chronological method for the determination of volcanic eruption using the 238U-230Th isochron method, it is necessary to make it clear that the 238U-230Th disequilibria was triggered solely by the eruption process. The elemental fractionation in magma during or after the volcanic eruption can be caused by melt-fluid-gas fractionation and crystallization of matrix elements. To analyse these processes from the natural samples, the analytical method for the elemental and isotopic compositions of volatile (H, C, N, O) and highly siderophile elements were developed. By analysing the U-Th fractionation process by vapour exsolution and crystal fractionation during the solidifying the groundmass minerals, the eruption age of young volcanics could have been determined. This results infer that the 238U-230Th isochron method can be applied for the determination of volcanic eruption younger than 300 ka

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  • Historical impact of Kosa on Japanese land to enhance soil ability to retain radiocesium

    Grant number：16H06188  2016.04 - 2019.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (A)  Grant-in-Aid for Young Scientists (A)

    Nakao Atsushi, Elliott Crawford, Tanaka Ryoji, Eguchi Tetsuya, Naruse Toshiro, Kubotera Hideo, Takahara Hikari

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    Grant amount：\19890000 （ Direct expense: \15300000 、 Indirect expense：\4590000 ）

    The enhancement effect of historical accumulation of Kosa-dust on the ability of soils to retain radiocesium (RCs) was hypothesized. To verify this hypothesis, mineral particles with a diameter of <20μm, a typical size range of Kosa-dust, were isolated from cumulative volcanic or peaty layers and subjected to the chemical, mineralogical, and isotopic analyses.
    This study obtained the following achievements that 1) higher inclusion of Kosa-dust, evidenced by K-Ar dating and quartz-δ18O values, well associated with both higher mica content and the ability of soils to retain RCs, 2) volcanic soils further away from volcanic craters have higher ability to retain RCs, and 3) higher deposition of Kosa-dust under the colder paleoclimate was much more important to enhance the ability of sols to RCs than that under warmer period.

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  • Earth history ocean floor section reconstruction project: Elucidation of environmental changes from Archean to Proterozoic

    Grant number：26257211  2014.04 - 2018.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)  Grant-in-Aid for Scientific Research (A)

    Kiyokawa Shoichi

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    Grant amount：\39650000 （ Direct expense: \30500000 、 Indirect expense：\9150000 ）

    Understanding of the Archean - Proterozoic deepsea ocean environment, we pick up 4 location to understand sedimentary sequence of each other sequence. 3.1Ga Australia Pilbara, 2.3Ga Ghana Birimian greenstone belt. 1.8 Ga Trans Hadson orogeny at formation time of the north America. 0.7Ga Egypt greenstone which contains BIF within volcaniclastics.
    We did Scientific drilling at GHB of Ghana. It successfully got 195 m long volcanosedimentary sequence. This Ghana age is very important to understand when oxidation occur and affected oceanic sediment. We do chemical analysis but machine time is so tight. This work is still on going. Based on the thin section work, each sedimentary sequence well preserved sedimentary environment, but Oxygen effect is still hardly understood at bottom of ocean. At the early Proterozoic time, Oxygen level is still very low, however, biogenic activity well identified several places.

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  • Elucidation of the dynamic magma system by precise time-scale evaluation

    Grant number：23340160  2011.04 - 2014.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    NAKAMURA Eizo, MAKISHIMA Akio, TANAKA Ryouji, KOBAYASHI Katsura

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    Grant amount：\19760000 （ Direct expense: \15200000 、 Indirect expense：\4560000 ）

    In order to understand the dynamic magma system of volcanoes, we attempted to develop new age dating methods then applied them to natural volcanic ejecta. Consequently, we established new U-Th-Ra disequilibrium dating method by using multi collection ICP-MS, and determined the duration of magma supply sequences of Fuji volcano. Additionally, we examined new K-Ar dating combining the spiked and the unspiked sensitivity method to determine eruption ages less than 0.1 Myrs. This method could be successfully applied for lavas from Bratan volcano in Indonesia. The dynamic eruption model regarding supervolcan eruptions driven by melt buoyancy was established.

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Media Coverage

  • 地球型惑星の材料物質：原始太陽系での進化過程解明 Newspaper, magazine

    科学新聞  科学新聞  １面  2021.6.11

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    Author：Other 

  • 同位体組成が記録する地球型惑星の形成環境 Newspaper, magazine

    読売新聞  読売新聞  2018.10

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    日本海新聞  日本海新聞  2017.5.28

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    NHK  NHK  2017.5.28

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    日本海新聞  日本海新聞  2019.7.10

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    Yahoo等  Yahooニュース等  2021.5

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    New York Times, 日本経済新聞ほか  New York Times, 日本経済新聞ほか  2012.1.18

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    NHK、TBSほか各テレビ局  2022.6

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    Washington Post, 朝日、毎日、日経、読売、産経新聞ほか新聞各紙  2022.6

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